I recently purchased a 2018 521, 1)It has a 112 Ultrex w 3 AGM batteries. Im looking for feedback, if replacing the 3 AGM's with 1 36V Lithium. If you have done this whats your feed back. and 2) It has a 12' Garmin livescope and HB Solix 12 on bow and Solix 15 on console. The issue is after only a couple of hours the battery is dead, ( Its running off the crankin battery) What would you use if putting the Units on their own lithium. I appreciate the feedback